Pressure gauge for pneumatic tires



Oct. 23, i923. LMLSZ A. BADowsKl PRESSURE GAUGE FOR PNEUMATIC TIRES Filed July 25. 1921 Patented @ab 2 3, Y

' fanriannjeanowsxnor CHARLESTON; W'nsrvrnernie.

. .transenneeenen non rnfnuriierre minitelI i d..Applieationgledlluly 2.3,.

`T all V"dJ/710m 'it mog/xeoaccrn it knovsn thatjl, ALFRED eitizen'of the United States, residing at Charleston, in the county or Kanawha and State of lWest Virginia, have invented new and YV'useful improvements inV `Pressure Gauges for Pneumatic Tires, of Which the following is a specilication. n Pressure gauges for pneumatic tires comv prise a stern which is necessarily ofV a re l diameter duetothe tact that it must extend through an vopening in the telloe.` The pressure gauge ot'the present invention involves a'holloiv stem which is con-V nected ivith thetiretube and ingvvhich. is

arranged a valve carrying plunger, thisV plunger being subjected to the tuber pressuie'and indicates by 'its positionl the tube pressure. Devices of this kind have heretofore been made.l

, directed primarily to the manner "of securing the Vspring resisting'the movement of the plunger to thev plunger.v This isro im'- portance due to the conlined space in which the` spring must be arranged as a largerv spring is desirable and also through-the neeessityifor making the connection secure and at the same time Without too great expense. Y l y VVThe invention is illustrated in the laccordinpanying drawings as follows:-d

Fig.' l shows a; central section through.

V the ikvlhe'el felloe with they pressure ,gauge in place. i. Fig. pressure gauge,

.F 3' an .enlarged View of the end of the'plunger shoiving the means of securing ,thespring.Y

l marks the felloe, 2 the rim,l a tire, 4

an inner tube, 5 a valve stemextendi'ngA through an opening 6 in the elloe, 7 a head on the' valve stem, 8 a Washer clampingthe tube against the head 7, and 9 nut on thev opening 3. In a-pressiire gaugefor pneumatic tires,V

stem exerting pressure on the Washer.

The stem. hasan opening l0 extending' through it andtheJ plunger 11 is movably Lmounted inthis opening. This, plunger has an axial opening '.12 extending throiigliit in Whichis' arranged the'valve 13. plungerr has a scaleli indicating tlie pounds te`wliich` it is'subjected andalso is pre-.

vided With' a 'key-Way l5" in which a key 16 on the stein operates preventing'the turningoi2 the plunger as the pumpis attached.

The plunger has a nipple 17 on Which-is Banoivsiii, a.

grubberftubejis secured ong-a nipple 20 exfcured on a screw thread The present invention isV 2 a central section through the' iezif seriaiiio. 487,145@ f secureda rubbertube ,1,8 bymeans of a Wire orthreadfwindingll.; .'llieIinner end of the tending from fa plug 2l screwed into the in'- ner end of the stem. vThe rubber is bound on the nipple by the twine yor WireQQ.

A spring 23 'has'anf axially extendingKA hooked end 24E, the hook of which vextends into an opening 25. The axiallyfextending position by merely heading downV thevva'lls of the key-Way at QGaSclearly shown in l V Fig. ,3, Theinner end ofthe springisse- 27 on .the pluri# ger Q1. 1

A transparent cap is provided Vcover*-l through which 7 5 ing the outer end of the stem the scale .may be observed. `lliat l 4claim as 'newv is V l. ln' a pressureV gauge for pneumatic 255i portionof the extension 24 isV` preferably,y f arranged in a key-Wayjsl and is locked in" tires, the combination vvitha tire stem of a 'valve ,carrying plunger in the stem"c0ny liiected With and subjectedv toltirepressure,

said ,plungerV` having Aa radially extendingl hook v'receiving-openingtherein'; and av coilv spring Within the stem Hresisting the movevment of the plungensaid spring having an. axially extending hooked end extending invreceiving openingv in the i to the.. hook plunger.

i 2. In a pressure gauge for pneumatic tires, f

the. combination vvitha tire stem of a valve carrying plunger connected With and sub-` liected to the tire Vpressure and movable in responseto said pressure,said plunger having an axially extending groove from which leads a radially extending hook-receiving..` f opening; anda coil spring'within thestem ,resisting the movement of the plunger, said spring having an axiall -extendinwliooked' L 1 "i Tv end hooked into said hook receiving opening, theaxiallyextending portion of the' no spring 'extending along the Vgroove to the the combination with a tire stem of a valve carrying `plunger connected Withandsubject-Y ed to tlieltire pressiiie and movablel in respense to ASaid pressure,said plungerhaving.; f

an axially. extending `groove romfvvhiclileads. a radially extending hook receiving Y iio l end'hookediiitosaid hook receiving opensof ing, the axially extending portion of the springextendingalong the grooveto the opening and secured inthe groove by overlying portions of the Walls of the groove.

e. In a pressure gauge for `pneumatic tires, jche combination with a tire stem having a. .key herein a `valve carrying plunger in the stem connected with and sub- Y Y jected to tire pressure and movable in response to said pressure, said plunger having an axially extending key-Way cooperating Ywith the key in the stem and a hook re- Larmes ceiving radially extending opening leading from the key Way; and a coil spring Within the stem resisting the movement or w the plunger, saidv spring having an axially extending hooked end hooked into said hook receiving opening, the axially extending; portion ofV the stein extending along the key-Way' tol-he opening.

In testimony whereof' have hereunto selJ iny hand, i

ALFRED nxnovvsxi. 

